All stimuli showed a θ ERS, with induced θ oscillations to standard and rare non-target stimuli being smaller than those to target stimuli. While the post-stimulus θ power measured after non-target stimuli significantly discriminated the groups, the induced θ power did not. Thus both groups showed enhanced levels of post-stimulus θ power induced by the non-target stimuli, but the relative difference in θ power between NACs and LTAAs was the same for the pre-stimulus and post-stimulus periods. Thus, the post-stimulus θ power effect is carried from the effect of pre-stimulus θ power.
